Grinding attachment for lathes.



C. V. GREENAMYER.

GRINDING ATTACHMENT FOR LATHES.

APPLICATION FILED OCT. 4. 1916.

1 %21 79%., Patented Apr. 3, 1917.

UFFIWE.

CLARENCE V. GREENAMYER, 015 L05 AN GE LJES,-GALIFORNIA, ASSIGNOR, 0F ONE-HALF TO JOSEPH MOMIJDLAN, 01E GLENDALE, CALIFORNIA.

Specification of Letters Ratent.

Patented Apr. 3, 1191?.

Application filed October a, 1916. Serial No. 128,663.

To all whom it may concern."

Be it known that I, CLARENCE V. GREEN- AMYER, a citizen of the United States, residing at the city of Los Angeles, county of Los Angeles, State of California, have invented new and useful Improvements in Grinding Attachments for Lathes, of which the following is a specification.

My present invention is an attachment for my tool grinding attachment for which I filed an application for Letters Patent on September 1st, 1916, Serial No. 117,987.

Heretofore when the jaws of a chuck required grinding it has been customary to remove the jaws and take them to the grinding machine and there grind them. It has also been the custom to grind the centering pin in like manner. In so doing it has been very diflicult to grind such parts on a first grinding so that they will run true. If not true they must be reground until true. It is the object of my invention to provide a grinding attachment for lathes by means of which the jaws of the chuck and the centering pin can be ground while positioned in the lathe.

In the drawings forming a part of this application Figure 1 is a top plan of so much of a lathe as is necessary to illustrate my invention with my grinding attachments in place thereon.

Fig. 2 is an end elevation of the parts shown in Fig. 1.

Fig. 3 is an enlarged detail of the end of the flexible shaft and its connections.

Referring to the drawings 5 represents the headstock of a lathe of any ordinary construction 'on the front side of which I mount my grinder attachment. A standard 6 is secured to the frame of the lathe by bolts 7. In the upper end of standard 6 is pivotally mounted at 8 the shaft frame 9. In the inner end of frame 9 is mounted a shaft 10 which carries a contact wheel 11 that engages pulley 12 of the lathe. The inner end of frame 9 is preferably bifurcated and shaft 10 passes across this furcation and has mounted thereon in said furcations a sheave wheel 13. The outer end of frame 9 is also preferably bifurcated and a shaft 14 is mounted on said end and passes across said bifurcations. On shaft 14 and in the furcations is mounted a sheave wheel 15 which is connected by belt 16 with wheel 13. Shaft 14 has mounted thereon an emery wheel or other grinding wheel 17. A brace arm 18 consisting of two parts connected by ah nge 19 located at one side of the longitudlnal center of the arm is pivotally connected at 20 to standard 6 and passes through a slot 21 in frame 9. When pulley 1 is in contact with pulley 12 arm 18 is 1n the position shown in Figs. 1 and 2 and the attachment is in its operative position ready to grind a tool when power is applied to run the lathe.

To prevent any accidental separation of pulleys 11 and 12 I coil spring 22 around the upper member of arm 18. One end of this spring bears on frame 9 and the other end bears against hinge 19. When arm 18 is broken outwardly or away from standard 6 wheel 11 is caused to separate from wheel 12 and spring 22 will then hold the frame so that wheel 11 will not contact with wheel 12 and the grinding attachment is then in its lnoperative position. A pin 23 keeps the upper member of arm 18 from separating from frame 9.

Thus far the description and operation of parts is the same as my former applicat1on.

My present improvement consists in extending shaft 10 far enough to the outer side of frame 9 to mount thereon a pinion 24. Adjacent to pinion 24 is secured to frame 9 a hole 25 in which is received a stub shaft 26 on which is mounted a pinion 27 which revolves with the shaft and meshes with pinion 24. A flexible coupling 28 connects shaft 26 with shaft 29 which last shaft is revolubly mounted in arm 30 adjustably secured in tool post 31 of the lathe. Shaft 29 carries a grinding disk 32 by means of which the jaws of the chuck or the centering pin can be quickly and truly ground without removing them from the lathe. A washer 33 and a cotter pin 34.- passing through the end of shaft 26 provide suitable means for holding the shaft in place in frame 9 and enables it to be quickly dis connected.

For grinding the jaws of the chuck or the center pin it is obvious that the grinding wheel of my other attachment is not reof my present attachment are all that 1s requlred. 4

Having described my invention what I claim is:

1. A lathe attachment comprising a shaft frame adapted to be attached to the head stock of a lathe; a shaft revolubly mounted in said frame; a contact Wheel on said shaft; a pinion on the shaft carrying the contact wheel; a stub shaft detachably secured to said shaft frame; a pinion on said stub shaft meshing with said first pinion; an arm adapted to be secured in the tool post of the lathe; a shaft mounted in said arm; a grinding disk mounted on said last shaft; and a flexible coupling connecting said last shaft with said stub shaft.

2. A lathe attachment comprising a standard adapted to be attached to the headstock of a lathe; a shaft frame pivotally mounted on said standard; a shaft mounted in said shaft frame; a contact wheel on said shaft;

a jointed brace hingedly connected to said standard and passing upwardly through said shaft frame, the pivot of the joint in said brace being between the standard and the center line of the brace; a spring coiled around the upper member of the brace and bearing against the shaft frame and adapted to cause the contact wheel to bear against the cone pulley when in engagement therewith; a pinion on the shaft carrying the contact Wheel; a stub shaft detachably secured to said shaft frame; a pinion on said stub shaft meshing with said first pinion; an arm adapted to be secured in the tool post of the lathe; a shaft mounted in said arm; a grinding disk mounted on said last shaft; and a flexible coupling connecting said last shaft with said stub shaft.

In witness that I claim the foregoing I have hereunto subscribed my name this 28th day of September, 1916.

' CLARENCE V. GREENAMYER. 

